Bug 531188: Don't call zlib with 0-length inputs (the avail_in is 0), otherwise zlib returns Z_BUF_ERROR, which we consider fatal.  The patch is contributed by Adam Langley of Google <agl@chromium.org>.  r=wtc,nelson.
Bug 531188: Don't call zlib with 0-length inputs (the avail_in is 0),
otherwise zlib returns Z_BUF_ERROR, which we consider fatal.  The patch is
contributed by Adam Langley of Google <agl@chromium.org>.  r=wtc,nelson.

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